karma: Error: Unable to access the 'prototype' property of an undefined object

Whenever I attempt to inject my service, the following error occurs:

(function () {

    describe('Test', function () {

        var $scope, $state, service,ctrl;

        beforeEach(function() {
            module('moduleApp');

            module(function($provide) {
                $provide.service('AppService', service);
            });

            inject(function($rootScope,$injector,$controller,AppService) {
                $scope = $rootScope.$new();
                $state = $injector.get('$state');
                service = $injector.get('AppService');
                ctrl = $controller('MyCtrl', {
                    $scope: $scope,
                    $state: $state,
                    AppService: service
                });
            });
        });


        it('should have a working UserSession service', function() {
            expect(service).to.exist;
        });


    });

}());

Error:

TypeError: Cannot read property 'prototype' of undefined
    at Object.instantiate (bower_components/angular/angular.js:4577:82)
    at Object.<anonymous> (bower_components/angular/angular.js:4438:24)
    at Object.invoke (bower_components/angular/angular.js:4570:17)
    at Object.enforcedReturnValue [as $get] (bower_components/angular/angular.js:4422:37)
    at Object.invoke (bower_components/angular/angular.js:4570:17)
    at bower_components/angular/angular.js:4387:37
    at getService (bower_components/angular/angular.js:4529:39)
    at Object.invoke (bower_components/angular/angular.js:4561:13)
    at Context.workFn (bower_components/angular-mocks/angular-mocks.js:2524:20)
    at window.inject.angular.mock.inject (bower_components/angular-mocks/angular-mocks.js:2496:37)
Error: Declaration Location
    at window.inject.angular.mock.inject (bower_components/angular-mocks/angular-mocks.js:2489:25)
    at Context.<anonymous> (test/unit/app/views/Test.js:17:13)
javascriptangularjskarma-runnerkarma-mocha

Answer №1

Why are you attempting this behavior?! Initially, you are instructing karma to utilize an undefined object called service as AppService, and subsequently trying to retrieve AppService from the injector and assign it back to service? This creates a never-ending loop.

If the focal point of your testing is the AppService, the following code block is unnecessary:

module(function($provide) {
    $provide.service('AppService', service);
});

If you require access to the service, you can simplify the process by executing the following:

inject(function($rootScope,$injector,$controller, _AppService_) {
    $scope = $rootScope.$new();
    $state = $injector.get('$state');
    service = _AppService_;
    ctrl = $controller('MyCtrl', {
        $scope: $scope,
        $state: $state,
        AppService: service
    });
});

Furthermore, if the component being tested relies on AppService, start by creating a mock service and then utilize provide. Remember, there is no need to inject it multiple times.

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